30 felt replacement used for steep slope roofing designed for use under all primary roofing types including Asphalt Shingles, Synthetic Shingles, Metal roofing, Tiles, Slate and Cedar Shakes 6X lighter and 20X stronger than 30 felt, Class A Fire ASTM E108, meets and exceeds ASTM D226 Types I II and D4689 Types II IV, Class 4 hail rating, ICC ES Approved synthetic construction inert to mold growth, Patented SureFoot slip resistant nodular walking surface, contributes to LEED points, certified minimum of 20 reclaimed content 100 recyclable, all temperature performance 40 to 240 deg F, 6 month UV exposure, cool light gray surface doesn’t expand or contract, dual logo custom printing available, Roll size of10 sq or 93 sqm